JP2013190542A - Composition for coating and plastic lens - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a composition for coating that adheres well to a plastic substrate such as a plastic lens substrate without a primer layer and is capable of forming a hard coat layer exhibiting high tolerance in a boiling test.SOLUTION: There is provided a composition for coating which includes (A) a co-hydrolysis-condensation product of bisphenol group-containing silane and UV absorbing group-containing silane, (B) colloidal particles of silicon oxide, (C) a reactive silyl group-containing acrylic resin, (D) a hardener and (E) a solvent. The inventive composition for coating adheres well to a plastic substrate without a primer layer and can form a hard coat layer excellent also in transparency of the appearance. A plastic lens having a hard coat layer using the inventive composition for coating on a plastic substrate, a polycarbonate resin lens in particular, has reduced degradation due to ultraviolet rays and sufficient impact resistance. It also has high tolerance in a boiling test, so its tolerance in an adherence test is dramatically improved.

Description

  The present invention relates to a coating composition capable of forming a transparent hard coat film that increases the surface hardness of a plastic substrate and imparts a high degree of ultraviolet shielding ability, and a plastic in which a film of the composition is formed on a plastic substrate The present invention relates to a lens, particularly a plastic lens using a polycarbonate resin as a plastic substrate.

  In recent years, plastics have been selected as materials for lenses because they are lighter than glass and have advantages in impact resistance, dyeability, workability, and the like. On the other hand, scratch resistance and heat resistance are inferior to those of glass, and various improvements and modifications have been made to overcome these drawbacks. As a method for improving the scratch resistance, a hard coat is applied to the substrate surface. The hard coat layer is made of a silicone-based coating composition whose main component is a hydrolyzate of silane or a mixture with silica.

  However, even if the silicone-based coating composition as described above was applied to a plastic lens substrate to form a hard coat layer, the adhesion was insufficient and neither initial adhesion nor boiling adhesion could be put into practical use. . Therefore, in order to provide adhesiveness, a two-step process of applying a primer to a substrate and then applying a hard coat solution is required. In particular, in a lens substrate made of a polycarbonate resin, adhesion to the hard coat layer is poor, and primer treatment is indispensable.

  In addition, the primer layer serves as an impact absorbing layer between the lens substrate and the hard coat layer, and helps to improve the impact resistance of the lens. It is known that when a coating layer is provided, the impact resistance is significantly deteriorated.

  However, since polycarbonate resin is superior in impact resistance compared to other resins, it can be a lens with impact resistance that can withstand practical use even without a primer layer. On the other hand, there has been a demand for a hard coat that has excellent adhesion without primer treatment.

  In order to obtain such a hard coat, Japanese Patent Application Laid-Open No. 06-256718 (Patent Document 1) contains a caprolactone-based polyester polyol as an adhesion promoter so that it adheres to a substrate without application of a primer. Things are disclosed. However, even if this compound can be included to obtain adhesiveness, the plastic provided with the hard coat layer has been whitened. If the amount of caprolactone-based polyester polyol was reduced to such an extent that it did not whiten, sufficient adhesion could not be obtained. The whitening phenomenon is extremely inconvenient for the lens, and such a coating could not be applied to a practical lens.

  A hard coat composition containing a reactive acrylic resin has been proposed in Japanese Patent Application No. 2003-312782. A hard coat composition containing a reactive acrylic resin exhibits excellent adhesion while suppressing the whitening phenomenon, and is also effective for a polycarbonate resin. A lens using this hard coat composition with respect to a lens substrate using a polycarbonate resin shows excellent results in tests such as appearance, initial adhesion, hardness, weather resistance, etc., but into a boiled aqueous solution In the boiling test in which the lens is immersed and inspected for resistance, cracks and film peeling occurred at an early stage.

  Coating of the plastic surface is mainly performed by a liquid phase method and a gas phase method. As an example of the liquid phase method, there is a method of obtaining a coating film having a dense glassy crosslinked structure by hydrolyzing and dehydrating and condensing alkoxysilane by a sol-gel method. On the other hand, as an example of the vapor phase method, a method is employed in which a silica film is vacuum-deposited on a substrate to form a protective film to increase the hardness. However, since such a coating film does not have the ability to absorb ultraviolet rays, there is a drawback that the plastic of the base material is deteriorated by ultraviolet rays.

  As a method to compensate for this drawback, a coating film containing an organic UV absorber such as benzophenone, benzotriazole, salicylate or substituted acrylonitrile, or an inorganic UV absorber such as titanium oxide or zinc oxide. Is known.

  However, these conventional coating films have poor heat resistance in the case of organic UV absorbers and have a limited UV shielding effect because they evaporate over time. There was a problem that the amount used was limited. In addition, in the case of using an inorganic ultraviolet absorber, in addition to yellowing itself by ultraviolet rays, generally, since the particle size is large, the transmittance of visible light is poor and the transparency is deteriorated. Therefore, the use in lens applications has been limited. JP-A-2-265976 (Patent Document 2) discloses an inorganic ultraviolet absorber having excellent transparency in which a zinc oxide fine powder having a particle size of 0.1 μm or less is monodispersed in a binder. However, a zinc oxide fine powder of 0.1 μm or less is expensive to manufacture, and many steps and time are required to disperse the fine powder in a binder.

Japanese Patent Laid-Open No. 06-256718 JP-A-2-265976

  The present invention has been made in view of the above circumstances, and on a plastic substrate such as a plastic lens substrate, a hard coat layer having good adhesion without a primer layer and having excellent resistance to boiling tests is formed. An object of the present invention is to provide a coating composition. In addition, by providing a hard coat layer formed of the coating composition of the present invention on a plastic, particularly a polycarbonate resin substrate, the surface hardness of the substrate is increased, the deterioration of the substrate due to ultraviolet rays is suppressed, and a transparent appearance is achieved. An object is to provide an improved plastic lens.

As a result of intensive studies to achieve the above object, the present inventors have found the following components (A) to (E):
(A) component: cohydrolyzed condensate of bisphenol group-containing silane and UV absorbing group-containing silane,
(B) component: colloidal particles of silicon oxide,
(C) component: reactive silyl group-containing acrylic resin,
(D) component: a curing agent,
(E) component: It discovered that the coating composition containing a solvent was effective in the solution of the said subject, and came to make this invention.

（式中、Ｒ¹〜Ｒ⁴は、水素原子、ハロゲン原子、アルキル基、アルコキシ基又はアリール基を示す。Ｒ⁵，Ｒ⁶は、それぞれ独立して、水素原子、炭素数１〜１０のアルキル基又は炭素数６〜１０のアリール基であり、Ｒ⁵とＲ⁶とが結合してこれらが結合する炭素原子と共に炭素数３〜１３の炭素環又は複素環を形成してもよく、これらの基に炭素原子を有する場合には、置換基として、炭素数１〜６のアルキル基、炭素数２〜６のアルケニル基又は炭素数１〜６のアルコキシ基を有することもできる。また、Ｙは独立に下記式

で示される基であり、Ｒ¹⁰は炭素数２〜６のアルキレン基であり、Ｒ¹¹，Ｒ¹²は、独立に炭素数１〜６のアルキル基である。ｎは０〜２の整数を示す。）
（Ａ−２）成分：

（式中、Ａ¹〜Ａ¹⁰は、水素原子、ヒドロキシ基、炭素数１〜６のアルキル基、又はＯＹであり、Ａ¹〜Ａ¹⁰のうち少なくとも１つがＯＹである。Ｙは上記の通りである。）
［３］
（Ａ）成分と（Ｂ）成分を、予め酸性触媒存在下で加水分解・縮合させてなることを特徴とする［１］又は［２］に記載のコーティング用組成物。
［４］
（Ｃ）成分の反応性シリル基含有アクリル樹脂が、（イ）紫外線吸収性アクリル単量体と、（ロ）アルコキシシリル基含有アクリル単量体と、（ハ）それ以外のアクリル単量体とを共重合して得られるアクリル樹脂である［１］〜［３］のいずれかに記載のコーティング用組成物。
［５］
（Ｄ）成分の硬化触媒が、アルミニウム化合物である［１］〜［４］のいずれかに記載のコーティング用組成物。
［６］
（Ｅ）成分の溶剤が、２つ以上の官能基を有する化合物である［１］〜［５］のいずれかに記載のコーティング用組成物。
［７］
プラスチックレンズ基材上に、［１］〜［６］のいずれかに記載の組成物により形成されたハードコート層を設けてなることを特徴とするプラスチックレンズ。
［８］
プラスチックレンズ基材がポリカーボネート樹脂基材である［７］に記載のプラスチックレンズ。 Accordingly, the present invention provides the following coating composition and plastic lens.
[1]
A coating composition comprising the following components (A) to (E):
(A) component: cohydrolyzed condensate of bisphenol group-containing silane and UV absorbing group-containing silane,
(B) component: colloidal particles of silicon oxide,
(C) component: reactive silyl group-containing acrylic resin,
(D) component: a curing agent,
(E) component: solvent [2]
The component (A) is a cohydrolyzed condensate obtained by cohydrolyzing the bisphenol group-containing silane of the following component (A-1) and the UV absorbing group-containing silane of the component (A-2). The coating composition according to [1].
(A-1) Component:

(In the formula, R ^{1 to} R ⁴ represent a hydrogen atom, a halogen atom, an alkyl group, an alkoxy group or an aryl group. R ⁵ and R ⁶ each independently represent a hydrogen atom, an alkyl having 1 to 10 carbon atoms. Or an aryl group having 6 to 10 carbon atoms, and R ⁵ and R ⁶ may be bonded to form a carbocyclic or heterocyclic ring having 3 to 13 carbon atoms together with the carbon atom to which these are bonded. When the group has a carbon atom, the substituent may have an alkyl group having 1 to 6 carbon atoms, an alkenyl group having 2 to 6 carbon atoms, or an alkoxy group having 1 to 6 carbon atoms. Independently

R ¹⁰ is an alkylene group having 2 to 6 carbon atoms, and R ¹¹ and R ¹² are independently an alkyl group having 1 to 6 carbon atoms. n shows the integer of 0-2. )
(A-2) Component:

(In the formula, A ^{1 to} A ¹⁰ are a hydrogen atom, a hydroxy group, an alkyl group having 1 to 6 carbon atoms, or OY, and at least one of A ^{1 to} A ¹⁰ is OY. Y is as described above. .)
[3]
The coating composition according to [1] or [2], wherein the component (A) and the component (B) are previously hydrolyzed and condensed in the presence of an acidic catalyst.
[4]
The reactive silyl group-containing acrylic resin of component (C) is (i) an ultraviolet-absorbing acrylic monomer, (b) an alkoxysilyl group-containing acrylic monomer, and (c) other acrylic monomers. The coating composition according to any one of [1] to [3], which is an acrylic resin obtained by copolymerization of
[5]
The coating composition according to any one of [1] to [4], wherein the curing catalyst of component (D) is an aluminum compound.
[6]
The coating composition according to any one of [1] to [5], wherein the solvent of component (E) is a compound having two or more functional groups.
[7]
A plastic lens comprising a plastic lens substrate and a hard coat layer formed of the composition according to any one of [1] to [6].
[8]
The plastic lens according to [7], wherein the plastic lens substrate is a polycarbonate resin substrate.

Even if there is no primer layer, the coating composition of the present invention can form a hard coat layer having excellent adhesion to a plastic substrate and excellent appearance transparency. In addition, a plastic lens having a hard coat layer formed of the coating composition of the present invention on a plastic substrate, particularly a polycarbonate resin lens, is suppressed in UV deterioration and has sufficient impact resistance.
Since the hard coat layer formed by the coating composition of the present invention has an ultraviolet shielding effect, the weather resistance of the plastic substrate can be improved by reducing ultraviolet rays. Moreover, since it has the outstanding tolerance with respect to a boiling test, the tolerance in a contact test improves greatly.

(1) Composition component The coating composition of the present invention comprises:
(A) a co-hydrolysis condensate of a bisphenol group-containing silane and a UV absorbing group-containing silane,
(B) silicon oxide colloidal particles,
(C) a reactive silyl group-containing acrylic resin,
(D) A curing catalyst and (E) a solvent are essential components.

（式中、Ｒ¹〜Ｒ⁴は、水素原子、ハロゲン原子、アルキル基、アルコキシ基又はアリール基を示す。Ｒ⁵，Ｒ⁶は、それぞれ独立して、水素原子、炭素数１〜１０のアルキル基又は炭素数６〜１０のアリール基であり、Ｒ⁵とＲ⁶とが結合してこれらが結合する炭素原子と共に炭素数３〜１３の炭素環又は複素環を形成してもよく、これらの基に炭素原子を有する場合には、置換基として、炭素数１〜６のアルキル基、炭素数２〜６のアルケニル基又は炭素数１〜６のアルコキシ基を有することもできる。また、Ｙは独立に下記式

で示される基であり、Ｒ¹⁰は炭素数２〜６のアルキレン基であり、Ｒ¹¹，Ｒ¹²は、独立に炭素数１〜６のアルキル基である。ｎは０〜２の整数を示す。） Each component is described in detail below.
[(A) component]
The raw material silane of the component (A) to be contained in the coating composition is preferably a bisphenol group-containing silane of the following component (A-1), preferably a UV absorbing group-containing silane of the component (A-2) Is a condensate obtained by cohydrolyzing
(A-1) Component:

(In the formula, R ^{1 to} R ⁴ represent a hydrogen atom, a halogen atom, an alkyl group, an alkoxy group or an aryl group. R ⁵ and R ⁶ each independently represent a hydrogen atom, an alkyl having 1 to 10 carbon atoms. Or an aryl group having 6 to 10 carbon atoms, and R ⁵ and R ⁶ may be bonded to form a carbocyclic or heterocyclic ring having 3 to 13 carbon atoms together with the carbon atom to which these are bonded. When the group has a carbon atom, the substituent may have an alkyl group having 1 to 6 carbon atoms, an alkenyl group having 2 to 6 carbon atoms, or an alkoxy group having 1 to 6 carbon atoms. Independently

R ¹⁰ is an alkylene group having 2 to 6 carbon atoms, and R ¹¹ and R ¹² are independently an alkyl group having 1 to 6 carbon atoms. n shows the integer of 0-2. )

（式中、Ａ¹〜Ａ¹⁰は、水素原子、ヒドロキシ基、炭素数１〜６のアルキル基、又はＯＹであり、Ａ¹〜Ａ¹⁰のうち少なくとも１つがＯＹである。Ｙは上記の通りである。） (A-2) Component:

(In the formula, A ^{1 to} A ¹⁰ are a hydrogen atom, a hydroxy group, an alkyl group having 1 to 6 carbon atoms, or OY, and at least one of A ^{1 to} A ¹⁰ is OY. Y is as described above. .)

（式中、Ｒ¹〜Ｒ⁴は、水素原子、ハロゲン原子、アルキル基、アルコキシ基又はアリール基を示す。Ｒ⁵，Ｒ⁶は、それぞれ独立して、水素原子、炭素数１〜１０のアルキル基又は炭素数６〜１０のアリール基であり、Ｒ⁵とＲ⁶とが結合してこれらが結合する炭素原子と共に炭素数３〜１３の炭素環又は複素環を形成してもよく、これらの基に炭素原子を有する場合には、置換基として、炭素数１〜６のアルキル基、炭素数２〜６のアルケニル基又は炭素数１〜６のアルコキシ基を有することもできる。また、Ｙは独立に下記式

で示される基であり、Ｒ¹⁰は炭素数２〜６のアルキレン基であり、Ｒ¹¹，Ｒ¹²は、独立に炭素数１〜６のアルキル基である。ｎは０〜２の整数を示す。） <1> The silane of the compound (I) as the component (A-1) has the following structure and will be described in detail.

(In the formula, R ^{1 to} R ⁴ represent a hydrogen atom, a halogen atom, an alkyl group, an alkoxy group or an aryl group. R ⁵ and R ⁶ each independently represent a hydrogen atom, an alkyl having 1 to 10 carbon atoms. Or an aryl group having 6 to 10 carbon atoms, and R ⁵ and R ⁶ may be bonded to form a carbocyclic or heterocyclic ring having 3 to 13 carbon atoms together with the carbon atom to which these are bonded. When the group has a carbon atom, the substituent may have an alkyl group having 1 to 6 carbon atoms, an alkenyl group having 2 to 6 carbon atoms, or an alkoxy group having 1 to 6 carbon atoms. Independently

R ¹⁰ is an alkylene group having 2 to 6 carbon atoms, and R ¹¹ and R ¹² are independently an alkyl group having 1 to 6 carbon atoms. n shows the integer of 0-2. )

（式中、Ｒ¹〜Ｒ⁶は上記と同じであり、Ｙ’は、独立に下記式

で示される基であり、Ｒ¹¹、Ｒ¹²、ｎは上記と同じであり、Ｒ’は水素原子又は炭素数１〜３のメチル基、エチル基、プロピル基等のアルキル基であり、ｍは０〜４の数である。） More specifically, the following can be mentioned.

(In the formula, R ^{1 to} R ⁶ are the same as above, and Y ′ is independently the following formula:

Wherein R ¹¹ , R ¹² and n are the same as above, R ′ is a hydrogen atom or an alkyl group such as a methyl group having 1 to 3 carbon atoms, an ethyl group or a propyl group, and m is It is a number from 0 to 4. )

In formulas (I) and (I ′), R ^{1 to} R ⁴ are a hydrogen atom, a halogen atom, an alkyl group, an alkoxyl group, or an aryl group, and R ^{1 to} R ⁴ may be the same or different. Well, specifically, halogen atoms such as hydrogen atom, chlorine atom, bromine atom, fluorine atom, methyl group, ethyl group, propyl group, isopropyl group, butyl group, isobutyl group, tert-butyl group, pentyl group, neopentyl Group, hexyl group, cyclohexyl group, octyl group and the like alkyl group having 1 to 8 carbon atoms, methoxyl group, ethoxyl group, propoxyl group, butoxyl group and the like, alkoxy group having 1 to 4 carbon atoms, phenyl group, tolyl And aryl groups having 6 to 10 carbon atoms such as a group, a xylyl group, and a naphthyl group.

R ⁵ and R ⁶ are a hydrogen atom, an alkyl group having 1 to 10 carbon atoms or an aryl group having 6 to 10 carbon atoms, and R ⁵ and R ⁶ may be the same or different, specifically Examples of the alkyl group include a methyl group, an ethyl group, a propyl group, an isopropyl group, a butyl group, an isobutyl group, a tert-butyl group, a pentyl group, a neopentyl group, a hexyl group, a cyclohexyl group, and an octyl group. Includes a phenyl group, a tolyl group, a xylyl group, a naphthyl group, and the like.

Also, R ^5, R ⁶ may combine these R ⁵ and R ⁶ may form a carbocyclic or heterocyclic ring having a carbon number of 3 to 13 together with the carbon atoms to which they are attached, further carbon into these groups When it has an atom, it has 1 to 6 carbon atoms such as a methyl group, an ethyl group, a propyl group, an isopropyl group, a butyl group, an isobutyl group, a tert-butyl group, a pentyl group, a neopentyl group, and a hexyl group as a substituent. C2-C6 alkenyl group such as alkyl group, vinyl group, allyl group, propenyl group, isopropenyl group, butenyl group, etc., C1-C6 alkoxy group such as methoxy group, ethoxy group, propoxy group, butoxy group You may have.

Here, examples of the carbocyclic or heterocyclic ring having 3 to 13 carbon atoms include those shown below.

（上記式中、Ｒ⁷，Ｒ⁸は上述した置換基として例示した基である。） Examples of the substituents include those shown below.

(In the above formula, R ⁷ and R ⁸ are groups exemplified as the substituents described above.)

で示される基であり、Ｒ¹⁰は、エチレン基、プロピレン基、イソプロピレン基、ブチレン基、イソブチレン基、ヘキシレン基等の炭素数２〜６のアルキレン基であり、Ｒ¹¹，Ｒ¹²は、メチル基、エチル基、プロピル基、イソプロピル基、ブチル基、イソブチル基、ｔｅｒｔ−ブチル基、ペンチル基、ネオペンチル基等の炭素数１〜６のアルキル基であり、Ｒ¹¹，Ｒ¹²はそれぞれ同一であっても異なっていてもよい。
ｎは０〜２の整数であり、好ましくは０又は１、特に０である。 Y is the following formula

R ¹⁰ is an alkylene group having 2 to 6 carbon atoms such as ethylene group, propylene group, isopropylene group, butylene group, isobutylene group, hexylene group, and R ¹¹ and R ¹² are methyl groups. Group, an ethyl group, a propyl group, an isopropyl group, a butyl group, an isobutyl group, a tert-butyl group, a pentyl group, a neopentyl group and the like, and R ¹¹ and R ¹² are the same. Or different.
n is an integer of 0 to 2, preferably 0 or 1, particularly 0.

（式中、Ｒ¹〜Ｒ⁶，Ｒ¹¹，Ｒ¹²，Ｒ’，ｎ，ｍは上記と同じであり、Ｘはヨウ素原子、塩素原子、臭素原子等のハロゲン原子である。） The method for producing the compound represented by the above formula (I) comprises a compound having two or more phenol groups represented by the following general formula (i) and an allyl compound or a methallyl compound represented by the following general formula (ii). After making it react and synthesize | combine the phenoxy ether compound which has an allyl group or a methallyl group, it can prepare by making the alkoxysilane which has the hydrosilyl group shown by the following general formula (iii) react in presence of a platinum catalyst.

(In the formula, R ^{1 to} R ⁶ , R ¹¹ , R ¹² , R ′, n, m are the same as above, and X is a halogen atom such as an iodine atom, a chlorine atom, or a bromine atom.)

  Specific examples of the compound having two or more phenol groups represented by the general formula (i) include bis (4-hydroxyphenyl) methane, 1,1-bis (4-hydroxyphenyl) ethane, 2,2- Bis (4-hydroxyphenyl) propane (common name, bisphenol A), 2,2-bis (4-hydroxyphenyl) butane, 2,2-bis (4-hydroxyphenyl) octane, bis (4-hydroxyphenyl) phenylmethane 1,1-bis (4-hydroxyphenyl) -1-phenylethane, bis (4-hydroxyphenyl) diphenylmethane, 2,2-bis (4-hydroxy-3-methylphenyl) propane, 1,1-bis ( 4-hydroxy-3-tert-butylphenyl) propane, 2,2-bis (3,5-dimethyl-4-hydroxypheny) ) Propane, 2,2-bis (4-hydroxy-3-phenylphenyl) propane, 2,2-bis (3-cyclohexyl-4-hydroxyphenyl) propane, 2,2-bis (4-hydroxy-3-bromo) Phenyl) propane, 2,2-bis (3,5-dibromo-4-hydroxyphenyl) propane, 1,1-bis (4-hydroxyphenyl) cyclopentane, 1,1-bis (4-hydroxyphenyl) cyclohexane, Examples include 2,2-bis (4-hydroxy-3-methoxyphenyl) propane. In particular, fluorene compounds represented by the following general formula (i ′) are preferably used as 2,2-bis (4-hydroxyphenyl) propane (common name, bisphenol A) and bisphenols having a fluorene structure in the side chain. The

（式中、Ｒ¹，Ｒ²，Ｒ⁷，Ｒ⁸は上記と同じである。）

(In the formula, R ¹ , R ² , R ⁷ and R ⁸ are the same as above.)

  Specific examples of the fluorene compound represented by the above formula (i ′) include 9,9-bis (4-hydroxyphenyl) fluorene, 9,9-bis (4-hydroxy-3-methylphenyl) fluorene, Examples thereof include 9-bis (4-hydroxy-3-ethylphenyl) fluorene.

  Bisphenol A is mass-produced inexpensively as a polycarbonate resin raw material, and when bisphenol A is used, it is possible to improve impact resistance without impairing heat resistance.

  The compound represented by the general formula (I) used in the present invention first reacts the compound having two or more phenol groups with a halogen having an allyl group or a methallyl group.

  More specifically, the compound represented by the general formula (i) and an allyl compound such as allyl chloride, allyl bromide, and allyl iodide, and a general formula (ii) such as methallyl chloride, methallyl bromide, and methallyl iodide. Such as alkali metal hydroxide, alkaline earth metal hydroxide, alkali metal alkoxide, alkaline earth metal alkoxide, alkali metal carbonate, alkaline earth metal carbonate, amines In the presence of a base, a phenoxy ether compound having an allyl group or a methallyl group is synthesized by reacting in a solvent inert to the reaction such as ketone, ester, ether or the like. The amount of the compound of the formula (i) and the allyl compound or the compound of the formula (ii) used may be 2 mol or more of the allyl compound or the compound of the formula (ii) with respect to 1 mol of the compound of the formula (i). More preferably, it is 2 to 5 mol, particularly preferably more than 2 mol to 3 mol. The reaction can be carried out in the range of room temperature to about 200 ° C., preferably 50 to 150 ° C. Usually, the reaction is completed in about 30 minutes to 10 hours at a temperature of about 120 ° C.

  Next, the compound obtained by the above reaction and the hydrosilane compound represented by the general formula (iii) in the presence of a platinum catalyst, if necessary, in a solvent inert to the reaction such as toluene and tetrahydrofuran, Or the compound shown by general formula (I) is compoundable by making it react without a solvent.

  As the hydrosilane compound represented by the general formula (iii), a hydrosilane compound having 1 to 3 alkoxy groups having 1 to 6 carbon atoms such as a methoxy group, an ethoxy group, a propoxy group, a butoxy group, and a pentoxy group can be used. The hydrosilane compound represented by the general formula (iii) is more preferably trimethoxysilane or triethoxysilane.

The reaction product of the compound of formula (i) and the allyl compound or compound of formula (ii) and the amount of the compound of formula (iii) used are the compound of formula (i) and the compound of allyl compound or formula (ii) The amount of the compound of formula (iii) is preferably 2 mol or more, more preferably more than 2 mol to 5 mol, per 1 mol of the reaction product.
The reaction can be carried out in the range of room temperature to about 150 ° C, preferably 25 to about 100 ° C. In the case of using trimethoxysilane, the reaction is completed in about 30 minutes to 2 hours by heating to room temperature to about 80 ° C.

（式中、Ａ¹〜Ａ¹⁰は、水素原子、ヒドロキシ基、炭素数１〜６のアルキル基、又はＯＹであり、Ａ¹〜Ａ¹⁰のうち少なくとも１つがＯＹである。Ｙは上述した通りである。） <2> The component (A-2) is a reactive ultraviolet absorber that is a benzophenone derivative having an alkoxysilyl group, and is represented by the following formula (II).

(In the formula, A ^{1 to} A ¹⁰ are a hydrogen atom, a hydroxy group, an alkyl group having 1 to 6 carbon atoms, or OY, and at least one of A ^{1 to} A ¹⁰ is OY. Y is as described above. .)

In the above formula, A ^{1 to} A ¹⁰ are hydrogen atom, hydroxy group, methyl group, ethyl group, propyl group, isopropyl group, butyl group, isobutyl group, tert-butyl group, pentyl group, neopentyl group, hexyl group, etc. alkyl group having 1 to 6 carbon atoms, or OY (Y are as described above.), and at least one of a ¹ to a ¹⁰ is OY.

で表される２つ以上のヒドロキシ基を有するベンゾフェノン（ｉｖ）と下記式（ｖ）

で表されるアリル化合物（ｖ）を反応させて、アリル基を有するベンゾフェノンを合成した後、下記式（ｖｉ）

で表されるヒドロキシ基を持つアルコキシシラン（ｖｉ）を、白金触媒の存在下で反応させて得られる。 This silane has the following formula (iv)

Benzophenone (iv) having two or more hydroxy groups represented by the following formula (v)

Benzophenone having an allyl group is synthesized by reacting the allyl compound (v) represented by the following formula (vi):

It is obtained by reacting an alkoxysilane (vi) having a hydroxy group represented by the following formula in the presence of a platinum catalyst.

A ^{1 to} A ¹⁰ in the general formula (II) are a hydrogen atom, a hydroxy group, an alkyl group having 1 to 6 carbon atoms, or an OY group, and at least one of A ^{1 to} A ¹⁰ is an OY group. .

R ^{21 to} R ³⁰ in the general formula (iv) are a hydrogen atom, an alkyl group having 1 to 6 carbon atoms, or a hydroxy group, and have at least two hydroxy groups.

  X ′ in the general formula (v) is a halogen atom such as an iodine atom, a bromine atom or a chlorine atom, and p is a positive number of 1 to 5.

R ³¹ and R ³² in the general formula (vi) represent an alkyl group having 1 to 6 carbon atoms. q represents an integer of 0 to 2.

  The benzophenone having two or more hydroxy groups represented by the general formula (iv) used in the present invention is obtained by reacting a phenol having two or more hydroxy groups with an aromatic carboxylic acid, thereby producing polyhydroxybenzophenones. Can be easily manufactured (for example, JP-A-5-70397).

  Specifically, 4,4′-dihydroxybenzophenone, 2,4-dihydroxybenzophenone, 2,3,4-trihydroxybenzophenone, 2,4,4′-trihydroxybenzophenone, 2,2 ′, 4-trihydroxy Benzophenone, 2,2 ′, 3,4-tetrahydroxybenzophenone, 2,3,4,4′-tetrahydroxybenzophenone, 2,2 ′, 4,4′-tetrahydroxybenzophenone, 2,2 ′, 3,4 , 4'-pentahydroxybenzophenone, 2,3-dihydroxy-4-methoxybenzophenone, 2,2'-dihydroxy-4-methoxybenzophenone, 2,4-dihydroxy-4'-methoxybenzophenone, 2,2'-dihydroxy- 3,4-dimethoxybenzophenone, 2,3-dihydroxy-4,4 ′ Dimethoxybenzophenone, 2,2′-dihydroxy-4,4′-dimethoxybenzophenone, 4-methoxy-2,2 ′, 4′-trihydroxybenzophenone, 4-methoxy-2 ′, 3 ′, 4′-trihydroxybenzophenone 4-butoxy-2,2 ′, 4′-trihydroxybenzophenone, 3,4-dimethoxy-2,2 ′, 4′-trihydroxybenzophenone, and the like.

  The compound represented by the general formula (II) used in the present invention can be produced by a reaction between the polyhydroxybenzophenone and a halogen having an allyl group.

  More specifically, the compound represented by the general formula (iv) and the allyl compound represented by the general formula (v) such as allyl chloride, allyl bromide, and allyl iodide, an alkali metal hydroxide, an alkali In the presence of bases such as earth metal hydroxides, alkali metal alkoxides, alkaline earth metal alkoxides, alkali metal carbonates, alkaline earth metal carbonates and amines, they are insensitive to reactions such as ketones, esters and ethers. It can be synthesized by reacting in an active solvent. The amount of the benzophenone of the formula (iv) and the allyl compound of the formula (v) used is preferably 1 to 1.5 mol of the allyl compound of the formula (v) with respect to 1 mol of the benzophenone of the formula (iv). The amount is preferably 1 to 1.2 mol. The reaction can be usually carried out in the range of room temperature to about 200 ° C., but is preferably performed at 50 to 150 ° C. Usually, the reaction is completed in about 30 minutes to 10 hours at a temperature of about 120 ° C.

  The compound represented by the general formula (II) is obtained by combining the compound obtained above and the hydrosilane compound represented by the general formula (vi) with respect to 1 mol of the compound obtained above. Is preferably 1 to 2 mol, more preferably more than 1 mol and 1.9 mol or less, in the presence of a platinum catalyst, if necessary, in a solvent inert to the reaction such as toluene and tetrahydrofuran. Or by reacting without solvent.

  As the hydrosilane compound, a hydrosilane compound having 1 to 3 alkoxy groups such as a methoxy group, an ethoxy group, a propoxy group, a butoxy group, and a pentoxy group represented by the formula (vi) can be used. More preferred are trimethoxysilane and triethoxysilane.

  The reaction can be carried out in the range of room temperature to about 200 ° C, but is preferably performed at 25 to about 100 ° C. In the case of using trimethoxysilane, the reaction is completed in about 30 minutes to 2 hours by heating to room temperature to about 60 ° C. The obtained reaction product is represented by the general formula (II).

  The (A-1) component and the (A-2) component silane cohydrolyzate have bisphenol-based and benzophenone-based skeletons in the molecule, which contributes to adhesion to the substrate and absorption of ultraviolet rays. In addition, the alkoxy group at the molecular end is hydrolyzed to produce highly reactive silanol, which can be polymerized by itself or combined with other binder components by condensation polymerization. In addition, this silane may exist also in the form of the oligomer by which a part of alkoxy group hydrolyzed and the silanol condensed.

  The co-hydrolysis of the component (A) is carried out under the conditions described later. In this case, as the other hydrolyzable silicon compound, an amount of 10 mol% or less with respect to the total silane compound, in particular 0 is added. A silane compound represented by the following formula (III) in an amount of 1 to 10 mol% can be used, but if it exceeds 10 mol%, sufficient transparency, adhesion and ultraviolet shielding properties cannot be obtained. There is.

B ¹ _a B ² _b Si (B ³ ) _4-ab (III)
(In the formula, B ¹ independently represents an alkyl group having 1 to 10 carbon atoms, and B ² represents an aryl group, a halogenated alkyl group, a halogenated aryl group, an alkenyl group, an epoxy group, a (meth) acryloyl group, a mercapto group. Represents a functional group containing one or more organic groups selected from the group consisting of amino group, ureido group, cyano group and isocyanato group, B ³ is an alkoxy group having 1 to 10 carbon atoms, alkenyloxy group, acyloxy group or alkoxyalkoxy A and b are each an integer of 0, 1 and 2, preferably 0 or 1, and a + b is an integer of 0, 1 and 2, and preferably 0 or 1 And particularly preferably 1.)

  Examples of the alkoxysilane represented by the above formula (III) include tetramethoxysilane, tetraethoxysilane, tetra n-propoxysilane, tetraisopropoxysilane, tetra n-butoxysilane, tetraisobutoxysilane, methyltrimethoxylane, and methyl. Triethoxysilane, ethyltrimethoxysilane, isobutyltrimethoxysilane, perfluoromethylethyltrimethoxysilane, perfluoroethylethyltrimethoxysilane, perfluorohexylethyltrimethoxysilane, perfluorooctylethyltrimethoxysilane, vinyltrimethoxysilane , Vinyltriethoxysilane, γ-methacryloxypropyltrimethoxysilane, γ-acryloxypropyltrimethoxysilane, β- (3,4-epoxycyclohexane Syl) ethyltrimethoxysilane, γ-glycidoxypropyltrimethoxysilane, γ-aminopropyltrimethoxysilane, N-β- (aminoethyl) -γ-aminopropyltriethoxysilane, γ-methacryloxypropylmethyldimethoxysilane Γ-acryloxypropylmethyldimethoxysilane, γ-glycidoxypropylmethyldimethoxysilane, γ-aminopropylmethyldimethoxysilane, γ-ureidopropyltrimethoxysilane, γ-ureidopropyltriethoxysilane, γ-isocyanatopropyltri Examples include methoxysilane, γ-isocyanatopropyltriethoxysilane, phenyltriethoxysilane, and phenyltrimethoxysilane. These may be used singly or in combination of two or more, or may be partially partially hydrolyzed in advance.

[Component (B)]
The (B) component silicon oxide colloidal particles are silicon dioxide fine particles, also called colloidal silica. A film made of a coating composition is contained for imparting scratch resistance. From the viewpoints of stability and dispersibility, those obtained by dispersing these colloidal particles in a dispersion medium are used. In particular, it is preferably used in a state (oxide sol) dispersed in a polar solvent such as water or alcohol.

  Here, (A) component which hydrolyzed and condensed the compound raw material which has the alkoxy silyl group of (A-1) component and (A-2) component is prepared by adding the colloidal silica of (B) component. Is preferred. This means that the component (A) is hydrolyzed in the presence of the component (B), thereby improving the transparency. That is, it is preferable to synthesize the coating composition of the present invention under conditions controlled so that colloidal silica is integrated when the hydrolysis condensate of component (A) is synthesized. When colloidal silica separates and aggregates, there is a concern that transparency and hardness are insufficient and scratch resistance is insufficient. It is possible to easily form an inorganic-organic hybrid by hydrolyzing the raw material of component (A) in the presence of the metal-OH group of colloidal silica to obtain a hydrolysis condensate of component (A). It becomes. The cured film thus obtained is a homogeneous, substantially colorless and transparent film having excellent properties such as scratch resistance, heat resistance, weather resistance, heat resistance and acid resistance.

  As the colloidal silica, those in which silica fine particles having a diameter of 5 to 200 nm, preferably 5 to 40 nm are colloidally dispersed in water or an organic solvent can be suitably used. In the present invention, the particle size is a value measured by a laser scattering type particle size distribution measuring device. Among these, acidic aqueous dispersion type colloidal silica is most suitable because it has a SiOH surface state that can be easily bonded when considering the reaction with the alkoxysilane hydrolysis condensate of component (A). When the production of component (A) is prepared by adding component (B) to the raw material of component (A), this method is efficient when an acidic or alkaline water-dispersed silicon dioxide sol is used. In the present invention, it is particularly preferable to use an acidic water-dispersed silicon dioxide sol.

  Specific examples of such colloidal silica include commercially available products, such as Snowtex O manufactured by Nissan Chemical Industries, Ltd., Catalloid SN manufactured by Catalyst Chemical Industries, Ltd., and Silica Doll manufactured by Nippon Chemical Industry Co., Ltd. 30A etc. are mentioned. Further, by adding various organic acids and inorganic acids to alkaline colloidal silica, the pH is stabilized in the colloidal silica acidic metastable region of 3 to 5, and the surface of which is made SiOH type can be used as well.

  Specific examples of the organic solvent dispersion type include PMA-ST, IPA-ST, NBA-ST, IBA-ST, EG-ST, XBA-ST, NPC-ST, DMAC-ST manufactured by Nissan Chemical Industries, Ltd. And OSCAL1132, OSCAL1232, OSCAL1332, OSCAL1432, OSCAL1532, OSCAL1632, and OSCAL1732, manufactured by Catalytic Chemical Industry Co., Ltd., and the like.

  The component (B) serves as a crosslinking agent because it forms a bond with the silanol group in the component (A) as a binder on the particle surface as a binder that gives the coating film hardness and abrasion resistance. It is considered. That is, hydroxyl groups (Si—OH) are present on the particle surface, and bond formation (Si—O—Si) is possible with the component (A). For the purpose of increasing the dispersion stability of the particles, a silane coupling agent, a tetraalkoxysilane such as tetraethoxysilane, a titanium coupling agent, a carboxyl group-containing organic polymer, or the like may be used.

  A hydrolysis catalyst may also be used. As the hydrolysis catalyst, conventionally known catalysts can be used, and particularly acidic hydrogen halides, carboxylic acids, sulfonic acids, acidic or weakly acidic oxides and inorganic salts, solid acids such as ion exchange resins, etc. Can be used. As these examples, an organic acid typified by acetic acid and maleic acid, a cation exchange resin having a sulfonic acid group or a carboxylic acid group on the surface, and the like can be suitably used. The amount of the hydrolysis catalyst is preferably 0.01 to 10 mol% with respect to 1 mol of all hydrolyzable groups. Moreover, it is preferable to hydrolyze under a weakly acidic condition, and it is preferable to make it react especially in pH within the range of 1-7. When the hydrolysis is not performed under weak acidity, the silanol group to be generated becomes unstable, the condensation reaction proceeds, aggregates and precipitates, and transparency may be impaired. The hydrolysis is preferably performed at 5 to 50 ° C., and the hydrolysis time is usually 10 minutes to 10 hours.

  Although there is no restriction | limiting in the upper limit of the amount of water for hydrolysis, It is 10 mol or less normally with respect to 1 mol of alkoxysilyl groups of (A) component, Especially 5 mol or less. This is achieved by setting the amount of water added to 1 to 10 moles, preferably 1 to 5 moles, and most preferably 1.01 to 3 moles per mole of alkoxysilyl group.

  If the amount of water added is insufficient, the terminal cannot be SiOH, and alkoxysilyl groups remain, and the object may not be sufficiently achieved in terms of hardness. On the other hand, when the amount of water added is too large, there is a concern that the obtained system may become unstable and various problems (whitening, bubbles, heterogeneity, etc.) may occur during film formation, which is not preferable. The water mentioned above refers to all moisture added to the system. That is, it is the sum including water contained in the added water-dispersed colloidal silica, hydrolysis catalyst, organic polymer and the like.

  It is preferable to add a polar organic solvent to the water used for the hydrolysis. Examples of the polar solvent include alcohols such as methanol, ethanol, propanol, isopropanol, butanol, isobutanol, t-butanol, diacetone alcohol, and ethylene glycol. And monoethylene glycol monoether, propylene glycol, propylene glycol monoether and the like.

  In order to obtain high hardness as a top film, it is necessary to condense following the hydrolysis. Condensation may be performed continuously following hydrolysis, and is usually performed under heating at a liquid temperature of room temperature or 100 ° C. Gelation may occur at temperatures higher than 100 ° C. Furthermore, the condensation can be promoted by distilling off the alcohol produced by hydrolysis at 80 ° C. or higher under normal pressure or reduced pressure. Furthermore, for the purpose of promoting condensation, a condensation catalyst such as a basic compound, an acidic compound, or a metal chelate compound may be added. Before or during the condensation step, an organic solvent may be added for the purpose of adjusting the progress and concentration of the condensation, or silica fine particles such as silicon dioxide sol dispersed in water or an organic solvent may be added. May be. In general, as silicone compounds undergo condensation, the molecular weight increases and the solubility in water and produced alcohol decreases, so the organic solvent to be added dissolves the product well and has a boiling point of 80 ° C. or higher. The organic solvent having a relatively high polarity is preferred.

  Specific examples of such organic solvents include alcohols such as isopropyl alcohol, n-butanol, isobutanol, t-butanol, diacetone alcohol; methylpropyl ketone, diethyl ketone, methyl isobutyl ketone, cyclohexanone, diacetone alcohol, and the like. Ketones; ethers such as dipropyl ether, dibutyl ether, anisole, dioxane, ethylene glycol monoethyl ether, ethylene glycol monobutyl ether, propylene glycol monomethyl ether, propylene glycol monomethyl ether acetate; propyl acetate, butyl acetate, cyclohexyl acetate, etc. Examples include esters.

  The number average molecular weight in terms of polystyrene in the GPC analysis of the product obtained by this condensation is more preferably 500 to 50,000, and still more preferably 1,000 to 20,000. If the molecular weight is lower than this range, the toughness of the coating film is low and cracks tend to occur. On the other hand, if the molecular weight is too high, the hardness tends to be low, and the resin in the coating film is phase-separated. May cause whitening of the coating film.

  The ratio of the component (A) and the component (B) used in the coating composition of the present invention is the composition stability, transparency of the resulting cured film, wear resistance, scratch resistance, adhesion and crack resistance. The solid content of the component (A) is 30 to 95% by mass, preferably 50 to 90% by mass, and the solid content of the component (B) with respect to the total solid content of the components (A) and (B). An organosiloxane coating composition having a content of 5 to 70% by mass, preferably 10 to 50% by mass, and having a substantially terminal SiOH type is suitable. As a compounding quantity, (B) component 5-300 mass parts with respect to 100 mass parts of (A) component as solid content, Especially 5-100 mass parts is preferable. The ratio of the components (A-1) and (A-2) in the component (A) is such that the mass ratio is (A-1) / (A-2) = 10/90 to 90/10. Is preferred. If the amount of (A-1) is too small, the adhesion to the substrate may decrease, and if it is too large, the ultraviolet shielding ability may be insufficient.

  By setting the terminal to the SiOH type, the organosiloxane resin composition can be applied to the surface of the object to be coated and dehydrated and condensed by simply heating to form a siloxane bond. At this time, if the terminal remains ≡SiOR (R is an alkyl group), it is necessary to hydrolyze after coating, which is easily influenced by environmental moisture. It is not appropriate because it is necessary. In the coating composition of the present invention, it is known that the alkoxysilane hydrolysis condensate used as the component (A) is likely to have hardness and scratch resistance due to ≡SiOH generated by hydrolysis of alkoxysilane. For this reason, manufacturing by controlling the amount of water under synthesis conditions is important for the development of high hardness, high scratch resistance, and high wear resistance.

  The colloidal sol other than the colloidal silica (B) may be added for the purpose of imparting various functions, for example, absorption of ultraviolet light, conductivity, photocatalytic activity, and refractive index control. Specifically, magnesium oxide, co-oxide of silicon oxide and magnesium oxide, calcium oxide, barium oxide, boron oxide, aluminum oxide, indium oxide, germanium oxide, tin oxide, Colloidal sols of zinc oxide, titanium oxide, zirconium oxide, cesium oxide, indium tin oxide, and tin antimony oxide can be used singly or as a mixture of two or more, and the surface can be made of silica or alumina. It may be covered. The particle diameter of these metal colloid sols is preferably 5 to 1,000 nm in order to maintain transparency.

[Component (C)]
Reactive silyl group-containing acrylic resin has properties as an adhesion promoter, and by using a coating composition containing this, a hard coat layer having excellent adhesion to a lens substrate is formed without primer treatment. It becomes possible.

  This polymer is a reactive material formed from an acrylic resin obtained by copolymerizing the following (a) UV-absorbing acrylic monomer, (b) an alkoxysilyl group-containing acrylic monomer, and (c) any other acrylic monomer. It is an acrylic polymer containing a silyl group and an ultraviolet absorbing group.

（式中、Ｚは水素原子又は塩素原子を示す。Ｒ⁴¹は水素原子、メチル基、又は炭素数４〜８の第三級アルキル基を示す。Ｒ⁴²は直鎖状又は分岐鎖状の炭素数２〜１０のアルキレン基を示す。Ｒ⁴³は水素原子又はメチル基を示す。ｒは０又は１を示す。） Here, (i) the ultraviolet-absorbing acrylic monomer is not particularly limited as long as it is a compound having at least one ultraviolet-absorbing group and acrylic group or methacryl group in the molecule. Examples of such a compound include benzotriazole compounds represented by the following general formula (IV) and benzophenone compounds represented by the general formula (V).

(In the formula, Z represents a hydrogen atom or a chlorine atom. R ⁴¹ represents a hydrogen atom, a methyl group, or a tertiary alkyl group having 4 to 8 carbon atoms. R ⁴² represents a linear or branched carbon. And represents an alkylene group having a number of 2 to 10. R ⁴³ represents a hydrogen atom or a methyl group, and r represents 0 or 1.)

（式中、Ｒ⁴³は上記と同じ意味を示す。Ｒ⁴⁴は置換又は非置換の直鎖状又は分岐鎖状の炭素数２〜１０のアルキレン基を示す。Ｒ⁴⁵は水素原子又は水酸基を示す。Ｒ⁴⁶は水素原子、水酸基、又は炭素数１〜６のアルコキシ基を示す。）

(Wherein R ⁴³ has the same meaning as described above. R ⁴⁴ represents a substituted or unsubstituted linear or branched alkylene group having 2 to 10 carbon atoms. R ⁴⁵ represents a hydrogen atom or a hydroxyl group. R ⁴⁶ represents a hydrogen atom, a hydroxyl group, or an alkoxy group having 1 to 6 carbon atoms.

  Specific examples of the benzotriazole-based compound represented by the general formula (IV) include, for example, 2- (2′-hydroxy-5 ′-(meth) acryloxyphenyl) -2H-benzotriazole, 2- (2 '-Hydroxy-3'-tert-butyl-5'-(meth) acryloxymethylphenyl) -2H-benzotriazole, 2- [2'-hydroxy-5 '-(2- (meth) acryloxyethyl) phenyl ] -2H-benzotriazole, 2- [2′-hydroxy-3′-tert-butyl-5 ′-(2- (meth) acryloxyethyl) phenyl] -5-chloro-2H-benzotriazole, 2- [ And 2'-hydroxy-3'-methyl-5 '-(8- (meth) acryloxyoctyl) phenyl] -2H-benzotriazole.

  Specific examples of the benzophenone compound represented by the general formula (V) include, for example, 2-hydroxy-4- (2- (meth) acryloxyethoxy) benzophenone, 2-hydroxy-4- (4- (meta ) Acryloxybutoxy) benzophenone, 2,2′-dihydroxy-4- (2- (meth) acryloxyethoxy) benzophenone, 2,4-dihydroxy-4 ′-(2- (meth) acryloxyethoxy) benzophenone, 2, , 2 ′, 4-trihydroxy-4 ′-(2- (meth) acryloxyethoxy) benzophenone, 2-hydroxy-4- (3- (meth) acryloxy-2-hydroxypropoxy) benzophenone, 2-hydroxy-4 -(3- (meth) acryloxy-1-hydroxypropoxy) benzophenone and the like can be mentioned.

  In particular, a benzotriazole-based compound represented by the formula (IV) is preferable, and 2- [2′-hydroxy-5 ′-(2- (meth) acryloxyethyl) phenyl] -2H-benzotriazole is particularly preferable. used.

  (B) The alkoxysilyl group-containing acrylic monomer is a compound comprising an alkoxysilyl group and a monovalent hydrocarbon group containing an acrylic group or a methacryl group, and a monovalent hydrocarbon group containing an acrylic group or a methacryl group. 3-acryloxypropyl group, 3-methacryloxypropyl group, etc. are recommended due to the availability of raw materials and ease of synthesis. Examples of alkoxysilyl groups include trialkoxysilyl groups, dialkoxysilyl groups, and monoalkoxysilyl groups. is there. The number of hydrolyzable groups is selected from an integer of 1 to 3, preferably 2 or 3, and particularly preferably 3, from the meaning of forming a network structure within a short time.

  Specific examples of these (b) components include 3-acryloxypropyltrimethoxysilane, 3-acryloxypropyltriethoxysilane, 3-acryloxypropyltris (ethoxyethoxy) silane, 3-methacryloxypropyltrimethoxysilane, Examples include 3-methacryloxypropyltriethoxysilane and 3-methacryloxypropyltris (ethoxyethoxy) silane.

  Specific examples of other acrylic monomers used in the present invention include methyl acrylate, methyl methacrylate, ethyl acrylate, ethyl methacrylate, propyl acrylate, propyl methacrylate, butyl acrylate, butyl methacrylate, hexyl acrylate, hexyl methacrylate. , Alkyl (meth) acrylates such as 2-ethylhexyl acrylate and 2-ethylhexyl methacrylate, and epoxy functional (meth) acrylates such as glycidyl methacrylate.

  The reactive silyl group-containing acrylic resin used in the present invention comprises (a), (b) and (c) components in the presence of an organic solvent and a free radical initiator, preferably from room temperature to the reflux temperature of the solvent, preferably Is obtained by reacting at a temperature of 50 to 150 ° C. The kind and amount of the solvent used may be the same as the organic solvent of the component (E) described below.

  As the free radical initiator, an azo compound or an organic peroxide can be used. Specifically, azobisisobutyronitrile, t-butyl hydroperoxide, cumene hydroperoxide, di-t-butyl peroxide, dialkyl is used. Examples include mill peroxide, benzoyl peroxide, t-butyl perbenzoate, and acetone peroxide. The amount of the free radical initiator is not particularly limited, but is preferably about 0.01 to 1% by mass with respect to the total amount of components (a), (b) and (c).

  In carrying out this polymerization, a chain transfer agent such as n-propanethiol, 1-hexanethiol, 1-decanethiol, benzenethiol, 3-mercaptopropyltrimethoxylane or 3-mercaptopropyltriethoxysilane is used. To control the molecular weight.

  It is preferable that content of (a) component and (b) component in a copolymer is 1-30 mass% in both (a) component and (b) component. When the amount of component (a) used is less than this range, the ultraviolet shielding property is lowered, which is not preferable. On the other hand, when it is more than this range, adhesion is deteriorated, which is not preferable. If the amount of the component (b) is less than this range, the adhesiveness is lowered, which is not preferred.

  The content of the component (C) in the coating composition is preferably 1 to 50% by mass and more preferably 2 to 30% by mass as a solid content in the composition. When the content is less than 1% by mass, a hard coat layer having sufficient adhesion may not be formed. When it exceeds 50% by mass, the decrease in hardness becomes conspicuous and the scratch resistance may be deteriorated.

[(D) component]
Component (D) is a curing catalyst that promotes a reaction in which a condensable group such as a silanol group or an alkoxy group condenses, and a catalyst that cures a film by reacting with an alkoxysilyl group, and an aluminum catalyst can be applied. .

  Examples of the curing catalyst of the present invention include aluminum compounds such as aluminum acetylacetonates such as tris (acetylacetonate) aluminum and diisopropoxy (ethylacetoacetate) aluminum, aluminum acetates and aluminum perchlorates. . Of these, tris (acetylacetonate) aluminum can be suitably used.

  The blending amount of the component (D) is not particularly limited as long as it is an amount effective for curing the components (A) to (C). On the other hand, the content is preferably 0.0001 to 30% by mass, more preferably 0.001 to 10% by mass. If it is less than 0.0001% by mass, curing may be insufficient and the hardness may decrease, and if it exceeds 30% by mass, cracks are likely to occur in the coating film, or if water resistance decreases, it is used remarkably. The possible time may be shortened and may not be realistic.

[(E) component]
The component (E) of the coating composition of the present invention is an organic solvent, does not dissolve a plastic substrate such as a polycarbonate resin as a substrate, dissolves the composition component, and the components (A) and (B) What is arbitrarily compatible with the hydrolysis solvent and the component (C) is required. A highly polar organic solvent is preferably the main solvent, and in particular, those having two or more functional groups such as alcohol and ether, alcohol and ketone, alcohol and ester, ether and ester are desirable. Specific examples of such organic solvents include alcohol and ether compounds such as ethylene glycol monoethyl ether, ethylene glycol monobutyl ether and propylene glycol monomethyl ether, and alcohol and ketone compounds such as diacetone alcohol and alcohol and ether. Examples of the compound of ethylene and ester include ethylene glycol monoethyl ether acetate, and examples of the compound of ether and ester include ethylene glycol monoethyl ether acetate, ethylene glycol monobutyl ether acetate, propylene glycol monomethyl ether acetate, propylene glycol monoethyl ether acetate, etc. Use one or a mixture of two or more selected from the group consisting of these Door can be.

  As the addition amount of the solvent, it is preferable to use an amount in which the solid content concentration of the composition of the present invention is 1 to 50% by mass, particularly 5 to 35% by mass. Outside this range, defects may occur in the coating film coated and cured with the composition. If the concentration is less than the above range, sagging, twisting, and spotting are likely to occur in the coating film, and the desired hardness and scratch resistance may not be obtained. If the concentration exceeds the above range, the coating film may be easily whitened or cracked.

[Other ingredients]
In addition to the above, the coating composition of the present invention may contain a dyeability-imparting agent in order to improve the dyeing performance. In addition, surfactants are added to improve the dispersibility of the coating composition, improve the smoothness and improve the wettability when applied to the lens substrate, accelerate the curing reaction, It is possible to contain a curing catalyst to make it possible, or to contain an antioxidant to improve weather resistance and heat resistance.

The viscosity of the coating composition of the present invention is preferably 2~300mm ² / s, more preferably 5 to 100 mm ² / s. Within this range, it becomes easy to apply a uniform transparent film in various coating methods. The measuring method of a viscosity is as mentioning later.

(2) Method for forming film As a method for applying the coating composition thus obtained, the substrate can be coated by a normal application method. For example, brush coating, spraying, dipping, flow coating, Various coating methods such as roll coating, curtain coating, spin coating, and knife coating can be selected. In this case, the coating composition of the present invention can be directly coated on the plastic substrate without necessarily applying a primer treatment.

  Examples of the base material used here include plastic molded bodies, which are preferably used for various plastic materials (organic resin base materials), and are preferably polycarbonate, polystyrene, acrylic resin, ABS resin, vinyl chloride resin, etc. A polycarbonate resin with high mechanical strength is optimally used. The polycarbonate resin is a polymer compound having a carbonate bond (—O—COO—) in the main chain of the molecule, and is a resin having excellent impact resistance due to thermoplasticity. By using this resin having excellent impact resistance for the lens substrate, a lens having impact resistance that can sufficiently withstand practical use even if a hard coat layer is provided without the primer layer serving as an impact absorbing layer. It is possible to do.

  Curing of the composition of the present invention may be left in the air and air dried, or may be heated. Although the curing temperature and the curing time are not limited, it is preferable to heat at a temperature lower than the heat resistant temperature of the substrate for 10 minutes to 2 hours. Specifically, it is more preferable to heat at 60 to 135 ° C. for 30 minutes to 2 hours. When polycarbonate resin is used as a base material, it is more preferable to heat at 80 to 130 ° C.

  The thickness of the coating film is not particularly limited and may be 0.01 to 1,000 μm, particularly 0.5 to 200 μm, but the coating film hardness, scratch resistance, long-term stable adhesion, and cracks In order to satisfy that no occurs, 1 to 100 μm is preferable. The above operation may be repeated to perform overcoating. In particular, the thickness is important for protecting the plastic substrate from ultraviolet rays, and is preferably 2 to 50 μm. If it is less than 0.01 μm, the ultraviolet shielding property may not be sufficient or the hardness may not be sufficient, and if it exceeds 1,000 μm, foaming is likely to occur and the transparency is not sufficient, or cracks are likely to occur. is there.

  Next, although an Example and a comparative example are given and this invention is demonstrated more concretely, this invention is not limited by this. Below, the synthesis example of the raw material silane of (A) component, the manufacture example of the acrylic resin of (C) component, the Example by a composition, and its evaluation are shown. The viscosity is a value calculated by measuring the flow time with a Canon Fenceke viscometer at 25 ° C. and calculated as a kinematic viscosity, or a value with a rotational viscometer (B type), and the refractive index is a refractive index meter manufactured by Atago Co. It is a value at 25 ° C. measured by RX7000X.

(1) Synthesis Example of Raw Material Silane of Component (A) [Synthesis Example 1] Synthesis of bisphenol group-containing silane 2,2′-bis (4- (4)) was added to a flask equipped with a nitrogen introduction tube, a stirrer, a condenser and a thermometer. Hydroxyphenyl) propane (92.6 g, 0.406 mol) and methyl isobutyl ketone (abbreviated as MIBK) (500 g) were added and dissolved by stirring. To this, 100 g (0.82 mol) of allyl bromide and 138 g (1 mol) of anhydrous potassium carbonate were added and vigorously stirred while heating at 110 ° C. for 5 hours in an oil bath.
The formed potassium bromide salt was removed by filtration. When MIBK was removed from the reaction solution by a vacuum strip, about 90 g of 2,2′-bis (4-allyloxyphenyl) propane transparent oil was obtained. Toluene was added thereto, washed with water, and stripped again under reduced pressure to obtain 83.9 g (0.272 mol) of colorless and transparent oily 2,2′-bis (4-allyloxyphenyl) propane ( Yield 67%, viscosity 48.8 mm ² / s, refractive index 1.5629 (wavelength 589 nm)).

30.8 g (0.1 mol) of the obtained 2,2′-bis (4-allyloxyphenyl) propane was dissolved in 70 ml of toluene. Two drops of platinum catalyst / chloroplatinic acid and tetramethyldivinyldisiloxane reactant (1 mass% platinum content toluene solution) were added thereto, and 26 g (0.21 mol) of trimethoxysilane was added dropwise at a temperature of 60 ° C.
The temperature was kept at 65 ° C. for 2 hours, after which the reaction mixture was cooled. After adding 5 g of Wakogel C-100 and removing the platinum catalyst by adsorptive filtration, the solvent was removed by a vacuum strip to obtain 53 g (0.096 mol) of a colorless and transparent oil (viscosity 198 mPa · s, refraction). Rate 1.5145 (589 nm)). The NMR spectrum was consistent with the structure of 2,2′-bis (4-trimethoxysilylpropoxyphenyl) propane. The yield was 96%. This silane is abbreviated as bisphenol-silane.

[Synthesis Example 2] Synthesis of UV-absorbing group-containing silane 4-Allyloxy-2-hydroxybenzophenone (25.4 g, 0.1 mol, manufactured by Aldrich) was suspended in 70 ml of toluene. The temperature was raised to 60 ° C. and dissolved, and two drops of a platinum catalyst / chloroplatinic acid and a tetramethyldivinyldisiloxane reaction product (a toluene solution containing 1% by mass of platinum) were added thereto, and trimethoxysilane ( 29.3 g, 0.24 mol) was added dropwise.
The temperature is maintained at about 65-85 ° C. for about 1-2 hours, after which the reaction mixture is cooled, 5 g of Wakogel C-100 is added, the platinum catalyst is adsorbed, filtered and the solvent is removed by a vacuum strip, 34.8 g (0.092 mol) of a red oily substance was obtained. The NMR spectrum of the main product was consistent with the structure of 2-hydroxy-4-trimethoxysilylpropoxybenzophenone. The yield was 92%. This silane is abbreviated as UV absorbing-silane.

(2) Production example of acrylic resin as component (C) [Synthesis Example 3]
A 2 liter flask equipped with a stirrer, a condenser and a thermometer was charged with 248 g of diacetone alcohol as a solvent, and heated to 80 ° C. under a nitrogen stream.
A monomer mixed solution prepared in advance (2- [2′-hydroxy-5 ′-(2-methacryloxyethyl) phenyl] -2H-benzotriazole (abbreviated as RUVA monomer, manufactured by Otsuka Chemical Co., Ltd.) 72 g, 400 g of γ-methacryloxypropyltrimethoxysilane (abbreviated as KBM-503, manufactured by Shin-Etsu Chemical Co., Ltd.) 80 g, methyl methacrylate (abbreviated as MMA) 270 g, diacetone alcohol (abbreviated as DAA) 600 g) and 150 g of a solution prepared by dissolving 3 g of V-59 (2,2′-azobis (2-methylbutyronitrile)) as a polymerization initiator prepared in advance in 200 g of diacetone alcohol was sequentially added.
After reacting at 80 ° C. for 30 minutes, the remaining monomer mixed solution and the remaining polymerization initiator solution were simultaneously added dropwise at 80 to 90 ° C. over 1.5 hours. Furthermore, it stirred at 80-90 degreeC for 5 hours.
The viscosity of the obtained copolymer solution is 5370 mPa · s, and the content of the ultraviolet absorbing unit in the copolymer is 18% by mass, and the content of the alkoxysilyl group unit is 20% by mass. Moreover, the weight average molecular weight by GPC analysis on the basis of standard polystyrene was 27,600. This copolymer solution is referred to as Ac polymer 1.

[Synthesis Example 4]
It carried out similarly to the synthesis example 3 except having used GMA (glycidyl methacrylate) instead of KBM-503. This copolymer solution is referred to as Ac polymer 2.
(Note) KBM-503: γ-methacryloxypropyltrimethoxysilane RUVA monomer: 2- [2′-hydroxy-5 ′-(2-methacryloxyethyl) phenyl] -2H-benzotriazole (RUVA-9)
3. Otsuka Chemical Co., Ltd.
The compositions and solution properties are summarized in Tables 1 and 2.

KBM-503: γ-methacryloxypropyltrimethoxysilane GMA: glycidyl methacrylate RUVA monomer: 2- [2′-hydroxy-5 ′-(2-methacryloxyethyl) phenyl] -2H-benzotriazole MMA: methyl methacrylate DAA: Diacetone alcohol V-59: 2,2′-azobis (2-methylbutyronitrile)

＊ポリマーの粘度は回転粘度計（Ｂ型）により測定した２５℃における値である。

* The viscosity of the polymer is a value measured at 25 ° C. measured by a rotational viscometer (B type).

(3) Preparation of silane / silica hydrolyzate and composition thereof [Example 1]
In a 2 liter flask equipped with a stirrer, a condenser and a thermometer, 125 g of propylene glycol monomethyl ether, 21 g of ion exchange water, 74 g of IPA silica sol (IPA-dispersed colloidal silica manufactured by Nissan Chemical Industries, Ltd., silica content 30% by mass), Bisphenol-silane 50 g and UV absorption-silane 50 g were charged and maintained at 20 ° C. with stirring. To this, 0.25 g of ion exchange resin Amberlyst 15 dry (organo Corp. cation exchange resin) was added and stirred at high speed. After stirring at 25 ° C. for 5 hours, the ion exchange resin was removed by filtration.
1.6 g of white powder of aluminum acetylacetonate was added as a curing catalyst, and after stirring at 25 ° C. for 3 hours, 50 g of Ac polymer 1 (produced in Synthesis Example 3, 40 mass% diacetone alcohol solution), PMA- 5 g of ST (manufactured by Nissan Chemical Industries, Ltd., 30% by mass propylene glycol monomethyl ether acetate solution of silica sol) was added and stirred for 1 hour. The coating solution thus obtained had a non-volatile content (150 ° C., 0.5 hour) of 33.3% by mass, a viscosity of 33.5 mm ² / s, and a refractive index of 1.4374. This is Example 1 of the composition.

[Example 2]
The same procedure as in Example 1 was performed except that 25 g of bisphenol-silane and 25 g of KBM-7603 (silane manufactured by Shin-Etsu Chemical Co., Ltd., perfluorohexylethyltrimethoxysilane) were used instead of 50 g of bisphenol-silane. The coating solution thus obtained had a nonvolatile content (150 ° C., 0.5 hour) of 35.1% by mass, a viscosity of 34.0 mm ² / s, and a refractive index of 1.4326. This is Example 2 of the composition.

[Comparative Example 1]
The same procedure as in Example 1 was performed except that 50 g of Ac polymer 2 (manufactured in Synthesis Example 4) was used instead of 50 g of Ac polymer 1 (manufactured in Synthesis Example 3). The coating solution thus obtained had a nonvolatile content (150 ° C., 0.5 hour) of 33.2% by mass, a viscosity of 33.7 mm ² / s, and a refractive index of 1.4378. This is designated as Comparative Example 1 of the composition.

[Comparative Example 2]
It carried out similarly to Example 1 except having used 50 g of KBM-7603 (Shin-Etsu Chemical Co., Ltd. silane) instead of 50 g of bisphenol-silane. The coating solution thus obtained had a nonvolatile content (150 ° C., 0.5 hour) of 33.5% by mass, a viscosity of 20.6 mm ² / s, and a refractive index of 1.4224. This is designated as Comparative Example 2 of the composition.

[Comparative Example 3]
Instead of 50 g of bisphenol-silane and 50 g of UV absorption-silane, 50 g of KBM-403 (manufactured by Shin-Etsu Chemical Co., Ltd. (γ-glycidoxypropyltrimethoxysilane)) and KBM-7603 (Shin-Etsu Chemical Co., Ltd.) The same procedure as in Example 1 was performed except that 50 g of silane (perfluorohexylethyltrimethoxysilane) manufactured was used. In the solution thus obtained, an acrylic resin was precipitated, and a good coating solution could not be obtained.

[Comparative Example 4]
A 2 liter flask equipped with a stirrer, a condenser and a thermometer was charged with 125 g of propylene glycol monomethyl ether, 21 g of ion-exchanged water, 50 g of bisphenol-silane and 50 g of UV absorption-silane, and maintained at 20 ° C. with stirring. To this, 0.25 g of ion exchange resin Amberlyst 15 dry (organo Corp. cation exchange resin) was added and stirred at high speed. After stirring at 25 ° C. for 5 hours, the ion exchange resin was removed by filtration.
Add 1.6 g of white powder of aluminum acetylacetonate as a curing catalyst, stir at 25 ° C. for 3 hours, and then add 50 g of Ac polymer 1 (produced in Synthesis Example 3, 40 mass% diacetone alcohol solution). Stir for 1 hour. The coating solution thus obtained had a non-volatile content (150 ° C., 0.5 hour) of 33.3% by mass, a viscosity of 54.7 mm ² / s, and a refractive index of 1.4495. This is designated as Comparative Example 4 of the composition.
Details of the compositions of Examples 1 and 2 and Comparative Examples 1 to 4 are summarized in Tables 3 and 4.

ＫＢＭ−７６０３：パーフルオロヘキシルエチルトリメトキシシラン
ＫＢＭ−４０３：γ−グリシドキシプロピルトリメトキシシラン

KBM-7603: Perfluorohexylethyltrimethoxysilane KBM-403: γ-glycidoxypropyltrimethoxysilane

[Examples 3 and 4, Comparative Examples 5 to 8]
The surface of a 0.5 mm polycarbonate resin plate (Iupilon sheet, manufactured by Mitsubishi Engineering Plastics Co., Ltd.) with a cleaned surface was applied as an example composition by the flow coating method. After air drying at room temperature for 20 minutes, it was cured at 120 ° C. for 60 minutes. These are referred to as Example 3 and Example 4. The coating film thus obtained was evaluated by the following evaluation method. When these were evaluated, the optical characteristics, film adhesion, hardness characteristics, etc. were all good.
As a comparative example, Comparative Examples 1, 2, and 4 of the composition were applied to the same polycarbonate resin plate by a flow coating method and cured under the same conditions. These are referred to as Comparative Examples 5, 6, and 8. When these were evaluated, in Comparative Examples 5 and 6, the optical characteristics were poor, and in Comparative Examples 5 and 8, the hardness characteristics were poor. Further, when the composition of Comparative Example 3 was used (Comparative Example 7), precipitation occurred and a coating solution could not be prepared.
The results of various physical property evaluations are summarized in Tables 5 and 6.
Only the plastic polycarbonate resin coated with the composition of the present invention can exhibit excellent transparency, film adhesion, and scratch resistance in addition to ultraviolet shielding properties.

Measurement and evaluation of various physical properties in the examples were performed by the following methods.
(1) Coating property: Evaluated according to the following criteria. The results are shown in Table 6.
○: Film appearance is uniform and transparent ×: Film appearance is non-uniform and / or turbid (2) Film appearance: The coating film appearance of the coating film was visually observed.
(3) Optical characteristics: The film transparency of the optical characteristics and the ultraviolet shielding ability were evaluated by measuring the ultraviolet / visible light transmission spectrum.
The UV / visible light transmission spectrum of the coating film formed on quartz glass (thickness 1 mm) was measured with a spectrophotometer U-3310 manufactured by Hitachi, Ltd. at a wavelength of 200 to 500 nm. The transparency of the film was evaluated with a transmittance of 400 nm, and the ultraviolet shielding ability was evaluated with a transmittance of 350 nm. Table 6 shows the evaluation results based on the following criteria.
UV shielding property ○: Transmissivity of light with a wavelength of 350 nm is 1% or less ×: Transparency with light transmittance of a wavelength of 350 nm exceeding 1% ○: Transparency of light with a wavelength of 400 nm is 90% or more ×: Wavelength of 400 nm The light transparency was less than 90%. (4) Film adhesion was evaluated for initial adhesion and boiling adhesion.
The initial adhesion is in accordance with JIS K5400, and the test piece is cut into 6 vertical and horizontal 6 mm intervals with a razor blade to make 25 grids, and a commercially available cellophane adhesive tape is adhered closely to the test piece. When the film was peeled off rapidly in the forward direction, the number of squares (X) remaining without peeling of the coating was indicated by X / 25.
For boiling adhesion, after immersing the test piece in boiling water for 2 hours, the appearance was visually observed and the adhesion test was performed in the same manner as described above.
Table 6 shows the evaluation results based on the following criteria.
○: X is 25 (no peeling)
X: X is less than 25 (with peeling)
(5) Hardness characteristics were evaluated by scratch resistance according to the Gakushin abrasion test.
A load of 1 kgf was attached with a Gakushin type abrasion tester, and the haze value after 10 reciprocations was measured. Evaluation was made according to the following criteria.
○: Hz ≦ 2
×: Hz> 2
(6) Table 6 shows the results of comprehensive evaluation based on the following criteria.
○: No item for x ×: One or more items for x

Claims (8)

A coating composition comprising the following components (A) to (E):
(A) component: cohydrolyzed condensate of bisphenol group-containing silane and UV absorbing group-containing silane,
(B) component: colloidal particles of silicon oxide,
(C) component: reactive silyl group-containing acrylic resin,
(D) component: a curing agent,
(E) component: solvent The component (A) is a cohydrolyzed condensate obtained by cohydrolyzing the bisphenol group-containing silane of the following component (A-1) and the UV absorbing group-containing silane of the component (A-2). The coating composition according to claim 1.
(A-1) Component:

(In the formula, R ^{1 to} R ⁴ represent a hydrogen atom, a halogen atom, an alkyl group, an alkoxy group or an aryl group. R ⁵ and R ⁶ each independently represent a hydrogen atom, an alkyl having 1 to 10 carbon atoms. Or an aryl group having 6 to 10 carbon atoms, and R ⁵ and R ⁶ may be bonded to form a carbocyclic or heterocyclic ring having 3 to 13 carbon atoms together with the carbon atom to which these are bonded. When the group has a carbon atom, the substituent may have an alkyl group having 1 to 6 carbon atoms, an alkenyl group having 2 to 6 carbon atoms, or an alkoxy group having 1 to 6 carbon atoms. Independently

R ¹⁰ is an alkylene group having 2 to 6 carbon atoms, and R ¹¹ and R ¹² are independently an alkyl group having 1 to 6 carbon atoms. n shows the integer of 0-2. )
(A-2) Component:

(In the formula, A ^{1 to} A ¹⁰ are a hydrogen atom, a hydroxy group, an alkyl group having 1 to 6 carbon atoms, or OY, and at least one of A ^{1 to} A ¹⁰ is OY. Y is as described above. .)   The coating composition according to claim 1 or 2, wherein the component (A) and the component (B) are previously hydrolyzed and condensed in the presence of an acidic catalyst.   The reactive silyl group-containing acrylic resin of component (C) is (i) an ultraviolet-absorbing acrylic monomer, (b) an alkoxysilyl group-containing acrylic monomer, and (c) other acrylic monomers. The coating composition according to claim 1, which is an acrylic resin obtained by copolymerization of   The coating composition according to any one of claims 1 to 4, wherein the curing catalyst of component (D) is an aluminum compound.   The coating composition according to any one of claims 1 to 5, wherein the solvent of component (E) is a compound having two or more functional groups.   A plastic lens comprising a hard lens layer formed of the composition according to claim 1 on a plastic lens substrate.   The plastic lens according to claim 7, wherein the plastic lens substrate is a polycarbonate resin substrate.